Pipe-cutter



(No Model.) r

H. GOMSTOCK.

PIPE CUTTER.

No. 440,017. Patented Nov. 4, 1890.

an: arms cm, maw-Lnum, wAsNmm'an, 04 c.

UNITED STATES PATENT OFFICE.

HARRY COMSTOCK, OF FULTON, NEW YORK.

PIPE-CUTTER.

SPECIFICATION forming part of Letters Patent No. 440,017, dated November 4, 1890.

Applicatiou'filed August 27,1890. Serial No. 363,200. (No model.)

To all whom it may concern-.-

Be it known that I, HARRY OoMsTooK, a citizen of the United States, residing at Fulton, in the county of Oswego and State of New York, have invented new and useful Improvements in Pipe-Cutters, of which the fiillowing is a specification.

It is the purpose of my invention to provide a die for apipe-cutting tool which is capable of accommodating the various sizes of pipe, which will prevent the pipe rolling from one side to the other by the friction of the cutters, and in which the burr shall be easily and smoothly removed. It is my purpose also to provide a die having a novel construction whereby the cutting devices shall be prevented from passing beyond a limit imposed by parallel plain surfaces arranged upon each side of the serrated faces by which the burr is removed.

It is my further purpose to provide a die of this kind with grooves or channels on each side of the serrated portions, which are adapted to receive oil and to form receptacles for the chips removed from the pipe by the cutters and by the burr-reducing portions, and to combine with the die thus formed parallel supporting-strips which shall arrest the pipe at the point where the cutting devices have fully entered the metal of the pipe, thereby taking the friction off the abrading-surfaces upon each side of the cutters.

My invention consists to these ends in the several novel features of construction and new combinations of parts, hereinafter fully set forth, and then specifically pointed out in the claims following this specification.

To enable others skilled in the art to practice my said invention, I will describe the same in detail, reference being had to the drawings accompanying this application, in which- Figure 1 is a perspective view of a die embodying my invention. Fig. 2 is a transverse section of one of the equal or similar parts of the die.

I show and describe in this application the cutting and burrtrimming devices only, the

tongs or the parts of the tool supporting said cutter being omitted, since their construction is entirely familiar and requires no special explanation.

In the said drawings, the reference-numeral 1 denotes the die-plate formed of a single piece of metal having angular shape, the two similar parts 2 and 3 being arranged relatively to each other at an angle of somewhat less than forty-five degrees. This angular die may be arranged and supported in the head of the shank or tool by any of the ordinary well-known constructions.

Upon the two converging or angular faces of the die are formed the cutters 3 ,of hardened steel, arranged in a substantially central line and substantially coextensive with the length of the inner converging faces of the die. Upon each side of these cutters and upon each face of the die is a serrated or roughened face or surface 4, which is adapted to act upon the burr caused by the action of the cutters upon the pipe, and upon the outer margins of these serrated or file-cut surfaces are formed grooves or channels 5, running parallel with the cutters and extending throughout the same distance on the face of the die, orIsubstantially so. Upon the converging faces of the die are also formed marginal ribs, strips, or surfaces 6, having smooth faces 7, which are substantially in the same plane with the serrated or roughened faces 4, by which the burr is removed from the extremities of the severed portions of the pipe. When applied to the pipe, it will be at once noted that the instant the cutters have penetrated the metal of the pipe far enough to bring the exterior surfacethereof into contact with the serrated or abraded surfaces 4 the exterior face will simultaneously make engagement with and rest upon the smooth faces 7 of the lateral or marginal raised portions 6, thereby preventing the cutters from making farther penetration and at the same time arresting the action of the serrated faces 4 upon the burr and upon the outer face of the pipe. The limitation of action in these respects will take place at the instant when the burr and scale are both fully removed from the ends of the pipe. If desired, oil may be poured into the grooves or channels 5, whereby the friction upon the pipe will be ICO decreased about one-half, and these channels will serve also to receive the chips and the waste metal dressed off the burr.

Heretofore and prior to my invention it has been customary to abrade the entire surface of the die on each side of the cutters 3,wherebya friction greatly in excess of that required is produced. Moreover, as the burr was dressed oif the file teeth would take into the surface of the pipe and wear the latter away, thereby allowing the cutters to sink deeper, and unless a close watch was kept the accuracy of the work would be seriously endangered. 7

By the marginal smooth-faced ribs 6, I arrest the action of the abrading-faces and of the cutters at the same point in all cases and in pipes of all sizes, giving a perfectly-uniform outer surface upon both extremities of the pipe.

What I claim is- 1. In a pipe-cutter, an angular die having its converging faces provided with cutters and with abrading-surfaces upon each side of said cutters, said die also having marginal ribs or strips, their smooth faces being ar} rangedin ornearly in the plane of the abrading-surfaces, substantially as described.

2. In a pipe-cutter, a die of angular form having cutters upon its converging faces and provided upon each side of said cutters with abrading-surfaces and with smooth-surfaced marginal ribs or strips separated from the abrading-surfaces by channels parallel with the cutters,.the smooth surfaces of the marginal ribs being substantially in the'plane of the abradingsurfaces, substantially as described.

3. In a pipe-cutter, a die 1, formed of a single piece of metal having angular form, its similar parts being provided with central cutters 3", abrading or serrated faces 4:, grooves or channels 5, and marginal ribs or strips 6, having smooth faces which lie in or nearly in the plane of the abrading-surfaces 4:, substantially as described.

In testimony whereof I have affixed my signature in presence of two witnesses.

HARRY COMSTOCK. Witnesses:

S. H. READ, 'l.- D. ABBOTT. 

